SSH远程主机秘钥失效的解决方法

一、问题描述：

远程主机的SSH秘钥发生了变化，在使用SSH远程登录的时候，提示如下

[root@localhost ~]# ssh root@172.16.48.10
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:HDjXJvu0VYXWF+SKMZjSGn4FQmg/+w6eV9ljJvIXpx0.
Please contact your system administrator.
Add correct host key in /Users/wangdong/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/wangdong/.ssh/known_hosts:46
ECDSA host key for 172.16.48.10 has changed and you have requested strict checking.
Host key verification failed.

提示中红色部分是问题关键，意思就是秘钥发生了变化，但是你的本机保存的是原来的秘钥

二、解决问题

　　ssh-keygen -R IP（远程的IP地址）

[root@localhost ~]# ssh-keygen -R 172.16.48.10
/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old

出现红色部分提示表示成功，然后重新使用SSH远程登录即可

[root@localhost ~]# ssh admin@172.16.48.10

welcome

admin@172.16.48.10's password: 

******************************************************************************
* Copyright (c) 2004-2015 Hangzhou H3C Tech. Co., Ltd. All rights reserved.  *
* Without the owner's prior written consent,                                 *
* no decompiling or reverse-engineering shall be allowed.                    *
******************************************************************************

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